100 percent of which number is 20?
Solution
Correct Answer: Option C
Let the rquired number be 'P'
According to the question,
\(\begin{array}{l}\frac{100\;\times\;\mathrm P}{100}\;=\;20\\=>\;\mathrm P\;=\;20\;\times\;\frac{100}{100}\;=\;20\end{array}\)
Hence, 100 percent of the number 20 is 20.
Now, you can also try for
20 percent of what number is 100
\(\begin{array}{l}\frac{20\;\times\;\mathrm P}{100}\;=\;100\\=>\;\mathrm P\;=\;\frac{100\;\times\;100}{20}\;=\;500\\=>\;\mathrm P\;=\;500\end{array}\)
Hence, 20 percent of the number 500 is 100.
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